SFI SYSTEM, Diagnostic DTC:P1660

DTC Code DTC Name
P1660 VSV for AICVS Circuit

DESCRIPTION

The air cleaner is equipped with 2 inlets, one of which is opened or closed by the air intake control valve. This system reduces intake noise and increases engine power at low-to-high engine speed ranges.

When the engine is operating in the low-to-mid speed range, this control operates the air intake control valve to close one of the air cleaner inlets. When the engine speed is higher than 3600 rpm and the opening angle of the throttle valve is more than 60°, the ECM activates the vacuum switching valve (for air intake control valve) and opens the air intake control valve.

A01EU84E04
DTC No. Detection Condition Trouble Area
P1660

The following conditions are met simultaneously for 0.5 seconds or more (2 trip detection logic):


  1. Voltage of terminal air intake control valve of the ECM is low when the VSV is off

  2. The engine has been started

  • Open or short in air intake control valve circuit

  • Air intake control valve

  • ECM

WIRING DIAGRAM

A01EVP2E02

INSPECTION PROCEDURE

Note

Inspect the fuses for circuits related to this system before performing the following inspection procedure.

Tech Tips

Read freeze frame data using the intelligent tester. The ECM records vehicle and driving condition information as freeze frame data the moment a DTC is stored. When troubleshooting, freeze frame data can help determine if the vehicle was moving or stationary, if the engine was warmed up or not, if the air fuel ratio was lean or rich, and other data from the time the malfunction occurred.

PROCEDURE


  1. PERFORM ACTIVE TEST USING INTELLIGENT TESTER (ACTIVATE THE VSV FOR AICS)


    1. A01EYNWE03
      Text in Illustration
      *1 Air
      *2 Port E
      *3 Port F
      *4 Air Filter
      *a Vacuum Switching Valve is On
      *b Vacuum Switching Valve is Off

      Disconnect the vacuum hose (Port F) from the vacuum switching valve (for air intake control valve).

    2. Connect the intelligent tester to the DLC3.

    3. Start the engine.

    4. Turn the tester on.

    5. Enter the following menus: Powertrain / Engine / Active Test / Activate the VSV for AICS.

    6. Check the operation of the vacuum switching valve (for air intake control valve) when the vacuum switching valve (for air intake control valve) is operated using the tester.

      Standard
      Tester Operation Specified Condition
      ON Air from port E flows out through port F
      OFF Air from port E flows out through the air filter

    NG

    INSPECT VACUUM SWITCHING VALVE (FOR AIR INTAKE CONTROL VALVE) Click here

    OK

    CHECK FOR INTERMITTENT PROBLEMS Click here

  2. INSPECT VACUUM SWITCHING VALVE (FOR AIR INTAKE CONTROL VALVE)


    1. Inspect the vacuum switching valve (for air intake control valve) Click here.


    NG

    REPLACE VACUUM SWITCHING VALVE (FOR AIR INTAKE CONTROL VALVE) Click here

    OK

  3. CHECK TERMINAL VOLTAGE (POWER SOURCE OF VACUUM SWITCHING VALVE (FOR AIR INTAKE CONTROL VALVE))


    1. A01EXZUE33
      Text in Illustration
      *a

      Front view of wire harness connector

      (to Vacuum Switching Valve (for Air Intake Control Valve))

      Disconnect the vacuum switching valve (for air intake control valve) connector.

    2. Turn the engine switch on (IG).

    3. Measure the voltage according to the value(s) in the table below.

      Standard Voltage
      Tester Connection Switch Condition Specified Condition
      A9-1 - Body ground Engine switch on (IG) 11 to 14 V

    NG

    CHECK HARNESS AND CONNECTOR (NO. 1 INTEGRATION RELAY - VACUUM SWITCHING VALVE (FOR AIR INTAKE CONTROL VALVE)) Click here

    OK

  4. CHECK HARNESS AND CONNECTOR (VACUUM SWITCHING VALVE (FOR AIR INTAKE CONTROL VALVE) - ECM)


    1. Disconnect the vacuum switching valve (for air intake control valve) connector.

    2. Disconnect the ECM connector.

    3. Measure the resistance according to the value(s) in the table below.

      Standard Resistance
      Tester Connection Condition Specified Condition
      A9-2 - E26-46 (AICV) Always Below 1 Ω
      A9-2 or E26-46 (AICV) - Body ground Always 10 kΩ or higher

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

    REPLACE ECM Click here

  5. CHECK HARNESS AND CONNECTOR (NO. 1 INTEGRATION RELAY - VACUUM SWITCHING VALVE (FOR AIR INTAKE CONTROL VALVE))


    1. Remove the No. 1 integration relay from the engine room relay block and junction block assembly.

    2. Disconnect the vacuum switching valve (for air intake control valve) connector.

    3. Measure the resistance according to the value(s) in the table below.

      Standard Resistance
      Tester Connection Condition Specified Condition
      1C-3 - A9-1 Always Below 1 Ω
      1C-3 or A9-1 - Body ground Always 10 kΩ or higher

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

    REPLACE NO. 1 INTEGRATION RELAY Click here